# Differences On One Side Of A Gulleys Equilibrium?

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Research question:
How does the mass (grams[±0.1g]) on one side of a pulley affect the mass (grams), and create equilibrium?

Hypothesis:
If the differences in masses (grams{±0.1g}) on each side of the pulley increases, then the mass in the middle of the two pulleys will be required to increase, because they will have to balance out each other’s mass to establish equilibrium. If the mass (grams{±0.1g}) on a side of a pulley decreases, then the mass in the middle of the two pulleys will be required to decrease, because they will be required to balance out each other’s weight to establish equilibrium.
The magnitude of the resultant will be lower if the weight of one of the pulleys is larger. So if the mass (grams{±0.1g}) of one of the pulleys
Use blue tack (tape is also fine) to attach the pulleys to the retort stand.
4. Cut a 40cm piece of string.
5. And cut that in half, so you’ll have 2 pieces of string both 20cm
6. Attach both the pulleys on each retort stand.
7. Wrap the strings around each retort stand and firmly tie them.
8. Punch two holes in the plastic cup
9. Carefully take each string and tie a knot inside the plastic cup.
10. Tie the strings, which are wrapped around the pulley, to the weighs.
11. Construct a raw data processing table.
12. Attach an A4 or A3 paper between the two retort stands.
13. Add the first two weights eg- 20g
14. Flash the light on the cup with pebbles. Make sure you get the reflection on the strings too.
15. Plot the points.
16. Calculate the resultants by joining the dots on the A4 piece of paper.
17. Complete the parallelogram using a compass or any other method.
18. Measure resultant.
19. Note it down.
20. Add another weight to one of the sides. Remember that you can only change the weight on one side of the pulleys. So it should be 20g and 30g for example.
21. Repeat steps 12-19
22. Now calculate the processed data such as the average.
23. Now create an appropriate graph based on your results.

Results:
If the cup isn’t the same mass, the reflection and resultant will be affected. Aim to use pebbles in a similar size, so even if the same amount of pebbles is in a cup, maybe one is larger than the other, therefore there will be an increase in the weight of the rocks and the mass will change, as will the reflection and the resultant.
Direction of light This can make unclear and inaccurate results in the experiment. It will change the angle of magnitude and can change the overall length of the resultant. The torch should be kept in one place, maybe on a flat surface so you can ensure it wont move, and the direction has to be consistent.
Distance between the stands The distance slightly changed, therefore caused a complete change in results because the string will be stretched. Measure the distance with a ruler before the practical. And measure it throughout the practical to make sure it hasn’t

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